/* eslint-disable */
/**
 * name: 创建编辑框，可拖动
 * author: add
 * time: 2018/9/3
 */
export default {
    bind(el, binding, vnode, oldVnode) {
        var canvas = el;
        const dialogHeaderEl = el;
        const dragDom = document.querySelector(".demo-ruleForm");
        // dialogHeaderEl.style.cursor = 'move';
        dialogHeaderEl.style.cssText += ";cursor:move;";
        dragDom.style.cssText += ";top:0px;";

        // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
        const sty = (function() {
            if (window.document.currentStyle) {
                return (dom, attr) => dom.currentStyle[attr];
            } else {
                return (dom, attr) => getComputedStyle(dom, false)[attr];
            }
        })();
        dialogHeaderEl.onmousedown = (e) => {
            // console.log(dialogHeaderEl);
            // console.log(e);
        // 鼠标按下，计算当前元素距离屏幕的距离
            const disX = e.clientX;
            const disY = e.clientY;
            const sleft = dialogHeaderEl.offsetLeft;
            const stop = dialogHeaderEl.offsetTop;
            const swidth = dialogHeaderEl.offsetWidth;
            const sheight = dialogHeaderEl.offsetHeight;
            const screenWidth = document.body.clientWidth; // body当前宽度
            const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取) 
            const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
            const dragDomheight = dragDom.offsetHeight; // 对话框高度
            const minDragDomLeft = dragDom.offsetLeft;
            const maxDragDomLeft = dragDomWidth;
            const minDragDomTop = dragDom.offsetTop;
            const maxDragDomTop = dragDomheight;
            // 获取到的值带px 正则匹配替换
            let styL = sty(dragDom, "left");
            let styT = sty(dragDom, "top");

            // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
            if (styL.includes("%")) {
                styL = +document.body.clientWidth * (+styL.replace(/\%/g, "") / 100);
                styT = +document.body.clientHeight * (+styT.replace(/\%/g, "") / 100);
            } else {
                styL = +styL.replace(/\px/g, "");
                styT = +styT.replace(/\px/g, "");
            };
            document.onmousemove = function(e) {
                // 通过事件委托，计算移动的距离
                // console.log(e)
                let left = e.clientX - disX;
                let top = e.clientY - disY;
                // console.log(left,top)
                // 边界处理
                if ((left + sleft)< 0) {
                    left  = -sleft;
                } else if ((left + sleft) > dragDomWidth - swidth) {
                    left  = dragDomWidth - sleft - swidth;
                };
                if ((top + stop) < 0) {
                    top = -stop;
                } else if ((top + stop) > dragDomheight - sheight) {
                    top = dragDomheight - stop - sheight;
                }
                // 移动当前元素
                
                dialogHeaderEl.style.cssText += `;left:${left + sleft}px;top:${top + stop}px;`;
                
                
            };
            document.onmouseup = function(e) {
                document.onmousemove = null;
                document.onmouseup = null;
            };
        };
    }
}